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// license:GPL-2.0+
// copyright-holders:Peter Trauner
/* TimeTop - GameKing */
/*
  PeT mess@utanet.at 2015

  Thanks to Deathadder, Judge, Porchy, Klaus Sommer, James Brolly & Brian Provinciano

  hopefully my work (reverse engineerung, cartridge+bios backup, emulation) will be honored in future
  and my name will not be removed entirely, especially by simple code rewrites of working emulation

  flashcard, handheld, programmer, assembler ready to do some test on real hardware

  todo:
  !back up gameking3 bios so emulation of gameking3 gets possible; my gameking bios backup solution should work
  search for rockwell r65c02 variant (cb:wai instruction) and several more exceptions, and implement it
    (with luck microcontroller peripherals match those in gameking)
  work out bankswitching and exceptions
  (improove emulation)
  (add audio)

  use gameking3 cartridge to get illegal cartridge scroller

  This system appears to be based on the GeneralPlus GPL133 system-on-chip or a close relative.
  Datasheet: http://www.generalplus.com/doc/ds/GPL133AV10_spec.pdf
*/

#include <stddef.h>
#include "emu.h"
#include "cpu/m6502/r65c02.h"
#include "bus/generic/slot.h"
#include "bus/generic/carts.h"
#include "softlist.h"

class gameking_state : public driver_device
{
public:
	gameking_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_cart(*this, "cartslot"),
		m_io_joy(*this, "JOY"),
		m_palette(*this, "palette")
		{ }

	DECLARE_DRIVER_INIT(gameking);
	virtual void machine_start() override;
	virtual void machine_reset() override;
	DECLARE_PALETTE_INIT(gameking);
	DECLARE_READ8_MEMBER(io_r);
	DECLARE_WRITE8_MEMBER(io_w);
	DECLARE_READ8_MEMBER(lcd_r);
	DECLARE_WRITE8_MEMBER(lcd_w);
	INTERRUPT_GEN_MEMBER(gameking_frame_int);
	TIMER_CALLBACK_MEMBER(gameking_timer);
	TIMER_CALLBACK_MEMBER(gameking_timer2);

	UINT32 screen_update_gameking(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	DECLARE_DEVICE_IMAGE_LOAD_MEMBER(gameking_cart);

	struct Gkio {
		UINT8 input, input2;
		UINT8 timer;
		UINT8 res3[0x2f];
		UINT8 bank4000_address; // 32
		UINT8 bank4000_cart; //33 bit 0 only?
		UINT8 bank8000_cart; //34 bit 7; bits 0,1,.. a15,a16,..
		UINT8 res2[0x4c];
	};
protected:
	required_device<cpu_device> m_maincpu;
	required_device<generic_slot_device> m_cart;
	required_ioport m_io_joy;
	required_device<palette_device> m_palette;

	memory_region *m_cart_rom;
	memory_bank *m_bank4000;
	memory_bank *m_bank8000;
	emu_timer *timer1;
	emu_timer *timer2;
};


WRITE8_MEMBER(gameking_state::io_w)
{
	if (offset != offsetof(Gkio, bank8000_cart))
		logerror("%.6f io w %x %x\n", machine().time().as_double(), offset, data);

	memory_region *maincpu_rom = memregion("maincpu");

	maincpu_rom->base()[offset] = data;
	if (offset == offsetof(Gkio, timer)) {
		m_maincpu->set_input_line(M6502_IRQ_LINE, CLEAR_LINE);
		timer1->enable(TRUE);
		timer1->reset(m_maincpu->cycles_to_attotime(data * 300/*?*/));
	}

	Gkio *io = reinterpret_cast<Gkio*>(maincpu_rom->base());
	if (offset == offsetof(Gkio, bank4000_address) || offset == offsetof(Gkio, bank4000_cart)) {
		UINT8 bank = io->bank4000_address ^ 1;
		UINT8 *base = io->bank4000_cart & 1/*?*/ && m_cart_rom ? m_cart_rom->base() : maincpu_rom->base() + 0x10000;
		m_bank4000->set_base(base + bank * 0x4000);
	}
	if (offset == offsetof(Gkio, bank8000_cart)) {
		UINT8 *base = io->bank8000_cart & 0x80/*?*/ && m_cart_rom ? m_cart_rom->base() : maincpu_rom->base() + 0x10000;
		UINT8 bank = io->bank8000_cart & 0x7f;
		m_bank8000->set_base(base + bank * 0x8000);
	}
}

READ8_MEMBER(gameking_state::io_r)
{
	memory_region *maincpu_rom = memregion("maincpu");
	UINT8 data = maincpu_rom->base()[offset];
	switch (offset) {
		case offsetof(Gkio, input):
			data = m_io_joy->read() | ~3;
			break;
		case offsetof(Gkio, input2):
			data = m_io_joy->read() | 3;
			break;
		case 0x4c: data = 6;
			break; // bios protection endless loop
	}

	if (offset != offsetof(Gkio, bank8000_cart))
		logerror("%.6f io r %x %x\n", machine().time().as_double(), offset, data);

	return data;
}

WRITE8_MEMBER( gameking_state::lcd_w )
{
	memory_region *maincpu_rom = memregion("maincpu");
	maincpu_rom->base()[offset+0x600]=data;
}

READ8_MEMBER(gameking_state::lcd_r)
{
	memory_region *maincpu_rom = memregion("maincpu");
	UINT8 data = maincpu_rom->base()[offset + 0x600];
	return data;
}

static ADDRESS_MAP_START( gameking_mem , AS_PROGRAM, 8, gameking_state )
	AM_RANGE(0x0000, 0x007f) AM_READWRITE(io_r, io_w)
	AM_RANGE(0x0080, 0x01ff) AM_RAM
	AM_RANGE(0x0200, 0x03ff) AM_RAM // lcd 2nd copy

	AM_RANGE(0x0600, 0x077f) AM_READWRITE(lcd_r, lcd_w)
	AM_RANGE(0x0d00, 0x0fff) AM_RAM // d00, e00, f00 prooved on handheld
//  AM_RANGE(0x1000, 0x1fff) AM_RAM    // sthero writes to $19xx

//  AM_RANGE(0x3000, 0x3fff) AM_ROMBANK("bank3000")
	AM_RANGE(0x4000, 0x7fff) AM_ROMBANK("bank4000")
	AM_RANGE(0x8000, 0xffaf) AM_ROMBANK("bank8000")
	AM_RANGE(0xffb0, 0xffff) AM_ROMBANK("bankboot") // cpu seems to read from 8000 bank, and for exceptions ignore bank
ADDRESS_MAP_END


static INPUT_PORTS_START( gameking )
	PORT_START("JOY")
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_START) PORT_NAME("Start")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_SELECT) PORT_NAME("Select") //?
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_BUTTON2) PORT_NAME("A") //?
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_BUTTON1) PORT_NAME("B")
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) //?
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) //?
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN )
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_JOYSTICK_UP)
INPUT_PORTS_END

static const unsigned char gameking_palette[] =
{
	255, 255, 255,
	127, 127, 127,
	63, 63, 63,
	0, 0, 0
};

PALETTE_INIT_MEMBER(gameking_state, gameking)
{
	for (int i = 0; i < sizeof(gameking_palette) / 3; i++)
		palette.set_pen_color(i, gameking_palette[i*3], gameking_palette[i*3+1], gameking_palette[i*3+2]);
}


UINT32 gameking_state::screen_update_gameking(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	for (int y=31, i=0;i<32;i++,y--)
	{
		for (int x=0, j=0;j<48/4;x+=4, j++)
		{
			memory_region *maincpu_rom = memregion("maincpu");
			UINT8 data=maincpu_rom->base()[0x600+j+i*12];
			bitmap.pix16(y, x+3)=data&3;
			bitmap.pix16(y, x+2)=(data>>2)&3;
			bitmap.pix16(y, x+1)=(data>>4)&3;
			bitmap.pix16(y, x)=(data>>6)&3;
		}
	}
	return 0;
}


DRIVER_INIT_MEMBER(gameking_state, gameking)
{
	timer1 = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gameking_state::gameking_timer), this));
	timer2 = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(gameking_state::gameking_timer2), this));
}

TIMER_CALLBACK_MEMBER(gameking_state::gameking_timer)
{
	m_maincpu->set_input_line(M6502_IRQ_LINE, ASSERT_LINE); // in reality int for vector at fff4
	timer1->enable(FALSE);
	timer2->enable(TRUE);
	timer2->reset(m_maincpu->cycles_to_attotime(10/*?*/));
}

TIMER_CALLBACK_MEMBER(gameking_state::gameking_timer2)
{
	memory_region *maincpu_rom = memregion("maincpu");
	m_maincpu->set_input_line(M6502_IRQ_LINE, CLEAR_LINE); // in reality int for vector at fff4
	timer2->enable(FALSE);
	timer1->enable(TRUE);
	Gkio *io = reinterpret_cast<Gkio*>(maincpu_rom->base());
	timer1->reset(m_maincpu->cycles_to_attotime(io->timer * 300/*?*/));
}

DEVICE_IMAGE_LOAD_MEMBER( gameking_state, gameking_cart )
{
	UINT32 size = m_cart->common_get_size("rom");

	if (size > 0x80000)
	{
		image.seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size");
		return IMAGE_INIT_FAIL;
	}

	m_cart->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
	m_cart->common_load_rom(m_cart->get_rom_base(), size, "rom");

	return IMAGE_INIT_PASS;
}

void gameking_state::machine_start()
{
	std::string region_tag;
	m_cart_rom = memregion(region_tag.assign(m_cart->tag()).append(GENERIC_ROM_REGION_TAG).c_str());

	m_bank4000 = membank("bank4000");
	m_bank8000 = membank("bank8000");

	memory_region *maincpu_rom = memregion("maincpu");
	memory_bank *bankboot=membank("bankboot");
	maincpu_rom->base()[0x10000+0x7ffe]=0xcf; // routing irq to timerint until r65c02gk hooked up
	bankboot->set_base(maincpu_rom->base()+0x10000+0x7fb0);
}

void gameking_state::machine_reset()
{
	memory_region *maincpu_rom = memregion("maincpu");
	maincpu_rom->base()[0x32] = 0; // neccessary to boot correctly
	maincpu_rom->base()[0x33] = 0;
	m_bank4000->set_base(maincpu_rom->base() + 0x10000 + 0x4000);
	//m_bank8000->set_base(maincpu_rom->base()+0x10000); //? no reason to enforce this yet
}

INTERRUPT_GEN_MEMBER(gameking_state::gameking_frame_int) // guess to get over bios wai
{
	//  static int line=0;
	//  line++;
	//  m_maincpu->set_input_line(M6502_IRQ_LINE, line&1? ASSERT_LINE: CLEAR_LINE); // in reality int for vector at fff4
}


static MACHINE_CONFIG_START( gameking, gameking_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", R65C02, 6000000)
	MCFG_CPU_PROGRAM_MAP(gameking_mem)
	MCFG_CPU_VBLANK_INT_DRIVER("screen", gameking_state,  gameking_frame_int)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", LCD)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_SIZE(48, 32)
	MCFG_SCREEN_VISIBLE_AREA(0, 48-1, 0, 32-1)
	MCFG_SCREEN_UPDATE_DRIVER(gameking_state, screen_update_gameking)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_PALETTE_ADD("palette", ARRAY_LENGTH(gameking_palette) * 3)
	MCFG_PALETTE_INIT_OWNER(gameking_state, gameking )

	/* cartridge */
	MCFG_GENERIC_CARTSLOT_ADD("cartslot", generic_plain_slot, "gameking_cart")
	MCFG_GENERIC_EXTENSIONS("bin")
	MCFG_GENERIC_LOAD(gameking_state, gameking_cart)
MACHINE_CONFIG_END

static MACHINE_CONFIG_DERIVED( gameking1, gameking )
	MCFG_SOFTWARE_LIST_ADD("cart_list", "gameking")
MACHINE_CONFIG_END

static MACHINE_CONFIG_DERIVED( gameking3, gameking )
	MCFG_SOFTWARE_LIST_ADD("cart_list", "gameking")
	MCFG_SOFTWARE_LIST_ADD("cart_list_3", "gameking3")
MACHINE_CONFIG_END


ROM_START(gameking)
	ROM_REGION(0x10000+0x80000, "maincpu", ROMREGION_ERASE00)
//  ROM_LOAD("gm218.bin", 0x10000, 0x80000, CRC(8f52a928) SHA1(2e791fc7b642440d36820d2c53e1bb732375eb6e) ) // a14 inversed
	ROM_LOAD("gm218.bin", 0x10000, 0x80000, CRC(5a1ade3d) SHA1(e0d056f8ebfdf52ef6796d0375eba7fcc4a6a9d3) )
ROM_END

ROM_START(gamekin3)
	ROM_REGION(0x10000+0x80000, "maincpu", ROMREGION_ERASE00)
	ROM_LOAD("gm220.bin", 0x10000, 0x80000, CRC(1dc43bd5) SHA1(f9dcd3cb76bb7cb10565a1acb070ab375c082b4c) )
ROM_END

CONS(2003,  gameking,    0,  0,  gameking1,    gameking, gameking_state, gameking,    "TimeTop",   "GameKing GM-218", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )
// the GameKing 2 (GM-219) is probably identical HW

CONS(2003,  gamekin3,    0,  0,  gameking3,    gameking, gameking_state, gameking,    "TimeTop",   "GameKing 3", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )
// gameking 3: similiar cartridges, accepts gameking cartridges, gameking3 cartridges not working on gameking (illegal cartridge scroller)
// my gameking bios backup solution might work on it